Class 300 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule XH Pipe
Class 300 A105/SA-105 Weld Neck Flange for Schedule XH Pipe
The Class 300 ASTM A105/ASME SA-105 ASME B16.5 Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule XH Pipe provides a strong, permanent connection for demanding industrial pressure piping systems. Its forged carbon steel construction, tapered weld neck, XH bore, and raised-face sealing surface provide dependable performance in commercial and industrial piping applications.
ASTM A105 / ASME SA-105 Forged Carbon Steel
Manufactured from ASTM A105 / ASME SA-105 forged carbon steel, this Class 300 weld neck flange offers excellent mechanical strength, toughness, and durability. A105/SA-105 is widely specified for pressure-containing components used in oil and gas, petrochemical processing, refineries, power generation, chemical processing, manufacturing, utilities, and industrial process piping systems.
The Class 300 designation represents an ASME pressure class, not a maximum working pressure of 300 PSI. Allowable pressure depends on material, operating temperature, and applicable pressure-temperature ratings.
Weld Neck Design for Schedule XH Pipe
A weld neck flange features a long tapered hub that provides a gradual transition from the flange body to the connecting pipe. The flange is butt welded directly to Schedule XH (Extra Heavy) pipe, producing a strong, permanent connection while helping distribute mechanical and piping stresses through the tapered hub.
The flange bore can be machined to correspond with the Schedule XH pipe wall thickness and inside diameter, helping provide proper internal alignment at the butt-weld joint.
Raised-Face Flange Design
The raised-face (RF) flange incorporates an elevated gasket seating surface around the bore. This design concentrates bolting force over the gasket area to help establish a reliable seal between compatible mating flanges.
Manufactured to applicable ASME B16.5 requirements, Class 300 weld neck flanges provide standardized dimensions, facing requirements, and pressure-temperature ratings.
When ordering, verify nominal pipe size, Schedule XH bore, Class 300 rating, raised-face configuration, A105/SA-105 material, and ASME B16.5 dimensional requirements for proper piping system compatibility.